platform/x86: hp-wmi: Introduce HPWMI_POWER_FW_OR_HW as convenient shortcut

For hardware blocked wireless switch we check two bits. Introduce
HPWMI_POWER_FW_OR_HW enum to increase readability and for easier
maintenance.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>